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The more effort you put into posting up your questions, the more effort users will put into replying. There is no such thing as a dumb question, but please don't be lazy...

Fair enough. I just dont understand why anyone building a track car wouldn't want to move the clutch slave, hose and starter away from the exhaust. Even if only to make the job of fitting a decent exh system easier, let alone the immense increase in reliability. Anyway, Im sick of saying it.

Now in other news I had the oppertunity to machine down a Y bellhousing and see how it fitted, it really doesnt look hard at all to convert. Machinging the bellhousing will mean a starter motor spacer is neded but that's no big deal.

what do you have to machine down exactly? I used a 3Y bell, took a 20V starter, cut one ear off and tigged it back on 30 degrees or so further around the (putting the mounting lugs in a shallow Vee rather than in line as per the 20V). Bolted it up and its working fine to this day. A nice compact, reliable yet serviceable (20V starters usually go in the scrap bin), reduction type starter.

In my eyes just something working isnt reason enough to do it when solutions that are far better are easily available. I mean, toyota put the 4AGE slave on the drivers side, yet hundreds of ADM/SR5 swaps have proven that this isn't a huge deal. Despite that, if I was building a race car for 10, 20 maybe 30 grand, I'd be building it to be as reliable as possible in every way, given how many things will come up that you didnt think of. Following from the 4AGE example, I think you would be absolutely crazy not to pay the $150 and grab a JDM bell. The same logic applies here, just with nearly twice the power and half the room - even moreso If even just to have easier access to the slave. You need cars to be reliable, but to also be rapidly serviceable should things go wrong. And they do. Slave cylinders and starter motors are right up on the list of what can go wrong at the track too. I would strongly suggest having them cool, and accessible.

I have machined down both sides of the bellhousing close to 8mm in total by memory. I have seen this once before to avoid the use of the double row spigot or an extender, but in this case the gearbox splines where not long enough to allow his twin plate clutch to work. So he took care of 2 problems at once.